I have created a simple project with a storyboard, and now realize that they don\'t support iOS 4.x and that I would like users with these devices to be able to download my
It's not possible to get xib files. Your storyboard is compiled to nib files and packaged into a storyboardc file within your app bundle.
To locate the nib files select your built executable in Finder and right-click 'Show package contents'. Navigate to the en.lproj directory and find the storyboard.storyboardc file. Right-click 'Show package contents' again on the storyboard file and you will find your nibs. They will not be much use to you though because they are compiled binary nibs.